Quantitative analysis method for factors affecting productivity of horizontal wells under open-hole completion mode

Abstract

The invention discloses a method for quantitative analysis of productivity influencing factors of horizontal wells in an open-hole well completion mode, which is carried out according to the following steps. The first step is to build a productivity model; the second step is to build a liquid-solid two-phase wellbore flow model; the third step is to pass the coupling relationship The liquid-solid two-phase wellbore flow model and the productivity model are coupled to obtain the mass flow model of the horizontal wellbore liquid-solid two-phase change; the fourth step is to collect relevant parameters of the oil well, and use the iterative method to solve the mass flow model of the horizontal wellbore liquid-solid two-phase change. Sensitivity calculation and analysis of wellbore size, crude oil physical properties and sand particle size were carried out. Fully analyze the formation characteristics of the horizontal well section, use the inherent existence relationship as the coupling relationship to couple the wellbore flow model and the productivity model, and then calculate the proportion of the influence factor on the productivity through the sensitivity calculation, so as to achieve the purpose of quantitative analysis and provide a basis for subsequent productivity simulation prediction It provides data support for the formulation of mining measures, etc., which has great value for discipline construction.

Description

technical field [0001] The invention relates to the field of oil reservoir productivity evaluation methods, in particular to a method for quantitative analysis of productivity influence factors of horizontal wells in an open-hole completion mode. Background technique [0002] The pressure drop in the horizontal wellbore is a factor that cannot be ignored in the calculation of the steady-state productivity of the horizontal well. Therefore, when calculating the productivity of the horizontal well, the coupling analysis and calculation of the horizontal wellbore and the reservoir should be fully carried out, so that the coupling is closer to the real bottom hole. Environment, at present, there are four main categories in mainstream academics, namely coupling of wellbore-steady-state (quasi-steady-state) productivity index, coupling of wellbore-reservoir inflow semi-analytical model, and wellbore treatment as porous medium-reservoir numerical simulation Coupling, wellbore-reser...

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Problems solved by technology

[0002] The pressure drop in the horizontal wellbore is a non-negligible factor in the calculation of the steady-state productivity of the horizontal well. Therefore, when calculating the horizontal well productivity, the coupling analysis and calculation of the horizontal wellbore and the reservoir should be fully performed to make the coupling more realistic. Environment, currently, mainstream academics are mainly divided into four categories, namely, wellbore-steady-state (pseudo-steady-state) productivity index coupling, wellbore-reservoir inflow semi-analytical model coupling, wellbore processing as porous media-reservoir numerical simulation Coupling, wellbore-reservoir coupling at the wellbore through iterative numerical simulation. However, when the above coupling is used for productivity analysis, it can only achieve qualitative analysis. The diameter of sand particles will affect the production of sandy crude oil, making it impossible to quantitatively evaluate and analyze these influencing factors, and it is difficult to restore the real bottom hole situation, and it is impossible to predict the production capacity or provide real and reliable information for the formulation of post-production processes. Data support, etc.

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